It is usually easy to spot arteries. They present a thick ring of pink tissue, with endothelium lining the inner surface.

The hole down the middle of a hollow organ is called the "lumen". Of course blood flows down the lumen of an artery.

This is an artery in the pancreas.

With your study partners, find:

• the large artery


• other, smaller blood vessels

Hotshots:

There is a little nerve to the left of the artery. If you remember what the schwann cell nuclei looked like, it will be easy for you to spot.

United States Pronunciations:

• Lumen: LOO-men

Roots:

• Lumen: light (Latin). You can see through a tube.

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Kansas City University of Medicine and Biosciences